Synonyms to tack on

add, adjoin, affix, agglutinate, algebraize, amalgamate, annex, append, assimilate, attach, augment, blend, burden, calculate, cast, cipher, clutter, coalesce, combine, come together, complicate, compound, comprise, compute, conjoin, connect, consolidate, cumber, decorate, divide, dope out, embody, encompass, encumber, enlarge, estimate, extract roots, fasten, figure, figure in, figure out, flux, foot, fuse, glue on, hitch on, include, incorporate, increase, infix, integrate, interblend, interfuse, join, join with, lump together, make one, measure, meld, melt into one, merge, mix, multiply, ornament, paste on, plus, postfix, prefix, put together, put with, reckon, reembody, roll into one, saddle, saddle with, score, shade into, slap on, solidify, subjoin, subtract, suffix, sum, summate, superadd, superimpose, superpose, syncretize, syndicate, synthesize, tag, tag on, take account of, take on, tally, tot, total, tote, unify, unite, unite with, work out, abut, abut on, appose, be contiguous, be in contact, befringe, bind, border, border on, bound, bring near